Index: COFF/DriverUtils.cpp
===================================================================
--- COFF/DriverUtils.cpp
+++ COFF/DriverUtils.cpp
@@ -858,8 +858,14 @@
 
   handleColorDiagnostics(Args);
 
-  for (auto *Arg : Args.filtered(OPT_UNKNOWN))
-    warn("ignoring unknown argument: " + Arg->getSpelling());
+  for (auto *Arg : Args.filtered(OPT_UNKNOWN)) {
+    std::string Nearest;
+    if (Table.findNearest(Arg->getAsString(Args), Nearest) > 1)
+      warn("ignoring unknown argument '" + Arg->getSpelling() + "'");
+    else
+      warn("ignoring unknown argument '" + Arg->getSpelling() +
+           "', did you mean '" + Nearest + "'");
+  }
 
   if (Args.hasArg(OPT_lib))
     warn("ignoring /lib since it's not the first argument");
Index: ELF/DriverUtils.cpp
===================================================================
--- ELF/DriverUtils.cpp
+++ ELF/DriverUtils.cpp
@@ -132,8 +132,14 @@
   if (MissingCount)
     error(Twine(Args.getArgString(MissingIndex)) + ": missing argument");
 
-  for (auto *Arg : Args.filtered(OPT_UNKNOWN))
-    error("unknown argument: " + Arg->getSpelling());
+  for (auto *Arg : Args.filtered(OPT_UNKNOWN)) {
+    std::string Nearest;
+    if (findNearest(Arg->getAsString(Args), Nearest) > 1)
+      error("unknown argument '" + Arg->getSpelling() + "'");
+    else
+      error("unknown argument '" + Arg->getSpelling() + "', did you mean '" +
+            Nearest + "'");
+  }
   return Args;
 }
 
Index: test/COFF/color-diagnostics.test
===================================================================
--- test/COFF/color-diagnostics.test
+++ test/COFF/color-diagnostics.test
@@ -6,7 +6,7 @@
 # RUN: not lld-link -xyz --color-diagnostics=always /nosuchfile 2>&1 \
 # RUN:   | FileCheck -check-prefix=COLOR %s
 
-# COLOR: {{lld-link: .\[0;1;35mwarning: .\[0mignoring unknown argument: -xyz}}
+# COLOR: {{lld-link: .\[0;1;35mwarning: .\[0mignoring unknown argument '-xyz'}}
 # COLOR: {{lld-link: .\[0;1;31merror: .\[0mcould not open /nosuchfile}}
 
 # RUN: not lld-link /nosuchfile 2>&1 | FileCheck -check-prefix=NOCOLOR %s
Index: test/COFF/driver.test
===================================================================
--- test/COFF/driver.test
+++ test/COFF/driver.test
@@ -19,3 +19,11 @@
 # RUN: yaml2obj < %p/Inputs/hello32.yaml > %t.obj
 # RUN: not lld-link /out:/ %t.obj 2>&1 | FileCheck -check-prefix=DIR %s
 DIR: cannot open output file
+
+# RUN: not lld-link -version 2>&1 | FileCheck -check-prefix=SPELLVERSION %s
+SPELLVERSION: ignoring unknown argument '-version', did you mean '--version'
+SPELLVERSION: no input files
+
+# RUN: not lld-link -nodefaultlibs 2>&1 | FileCheck -check-prefix=SPELLNODEFAULTLIB %s
+SPELLNODEFAULTLIB: ignoring unknown argument '-nodefaultlibs', did you mean '-nodefaultlib'
+SPELLNODEFAULTLIB: no input files
Index: test/COFF/wx.s
===================================================================
--- test/COFF/wx.s
+++ test/COFF/wx.s
@@ -8,8 +8,8 @@
 # RUN: lld-link /out:%t.exe /entry:main -notarealoption /WX /WX:NO %t.obj 2>&1 | \
 # RUN:   FileCheck -check-prefix=WARNING %s
 
-# ERROR: error: ignoring unknown argument: -notarealoption
-# WARNING: warning: ignoring unknown argument: -notarealoption
+# ERROR: error: ignoring unknown argument '-notarealoption'
+# WARNING: warning: ignoring unknown argument '-notarealoption'
 
 .text
 .global main
Index: test/ELF/basic.s
===================================================================
--- test/ELF/basic.s
+++ test/ELF/basic.s
@@ -234,7 +234,7 @@
 # NO_O_VAL: -o: missing argument
 
 # RUN: not ld.lld --foo 2>&1 | FileCheck --check-prefix=UNKNOWN %s
-# UNKNOWN: unknown argument: --foo
+# UNKNOWN: unknown argument '--foo'
 
 # RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t
 # RUN: not ld.lld %t %t -o %t2 2>&1 | FileCheck --check-prefix=DUP %s
Index: test/ELF/color-diagnostics.test
===================================================================
--- test/ELF/color-diagnostics.test
+++ test/ELF/color-diagnostics.test
@@ -6,7 +6,7 @@
 # RUN: not ld.lld -xyz -color-diagnostics=always /nosuchfile 2>&1 \
 # RUN:   | FileCheck -check-prefix=COLOR %s
 
-# COLOR: {{ld.lld: .\[0;1;31merror: .\[0munknown argument: -xyz}}
+# COLOR: {{ld.lld: .\[0;1;31merror: .\[0munknown argument '-xyz'}}
 # COLOR: {{ld.lld: .\[0;1;31merror: .\[0mcannot open /nosuchfile}}
 
 # RUN: not ld.lld -color-diagnostics=foobar 2>&1 | FileCheck -check-prefix=ERR %s
Index: test/ELF/driver.test
===================================================================
--- test/ELF/driver.test
+++ test/ELF/driver.test
@@ -3,8 +3,8 @@
 # RUN: not ld.lld --unknown1 --unknown2 -m foo /no/such/file -lnosuchlib \
 # RUN:   2>&1 | FileCheck -check-prefix=UNKNOWN %s
 
-# UNKNOWN: unknown argument: --unknown1
-# UNKNOWN: unknown argument: --unknown2
+# UNKNOWN: unknown argument '--unknown1'
+# UNKNOWN: unknown argument '--unknown2'
 # UNKNOWN: unknown emulation: foo
 # UNKNOWN: cannot open /no/such/file
 # UNKNOWN: unable to find library -lnosuchlib
@@ -22,6 +22,9 @@
 # RUN: not ld.lld -v xyz 2>&1 | FileCheck -check-prefix=VERSION %s
 # VERSION: LLD {{.*}} (compatible with GNU linkers)
 
+# RUN: not ld.lld --versin 2>&1 | FileCheck -check-prefix=SPELLVERSION %s
+# SPELLVERSION: unknown argument '--versin', did you mean '--version'
+
 ## Attempt to link DSO with -r
 # RUN: ld.lld -shared %t -o %t.so
 # RUN: not ld.lld -r %t.so %t -o %tfail 2>&1 | FileCheck -check-prefix=ERR %s