diff --git a/mlir/include/mlir/Dialect/StandardOps/IR/Ops.td b/mlir/include/mlir/Dialect/StandardOps/IR/Ops.td
--- a/mlir/include/mlir/Dialect/StandardOps/IR/Ops.td
+++ b/mlir/include/mlir/Dialect/StandardOps/IR/Ops.td
@@ -379,7 +379,7 @@
     operands. For example:
 
     ```mlir
-		%0 = alloca() : memref<8x64xf32>
+    %0 = alloca() : memref<8x64xf32>
     ```
 
     The optional list of dimension operands are bound to the dynamic dimensions
@@ -387,7 +387,7 @@
     bound to the second dimension of the memref (which is dynamic).
 
     ```mlir
-		%0 = alloca(%d) : memref<8x?xf32>
+    %0 = alloca(%d) : memref<8x?xf32>
     ```
 
     The optional list of symbol operands are bound to the symbols of the
@@ -395,7 +395,7 @@
     the symbol 's0' in the affine map specified in the allocs memref type.
 
     ```mlir
-		%0 = alloca()[%s] : memref<8x64xf32,
+    %0 = alloca()[%s] : memref<8x64xf32,
                                affine_map<(d0, d1)[s0] -> ((d0 + s0), d1)>>
     ```
 
@@ -441,6 +441,34 @@
   let hasFolder = 1;
 }
 
+//===----------------------------------------------------------------------===//
+// AssertOp
+//===----------------------------------------------------------------------===//
+
+def AssertOp : Std_Op<"assert"> {
+  let summary = "Assert operation with message attribute";
+  let description = [{
+    Assert operation with single boolean operand and an error message attribute.
+    If the argument is `true` this operation has no effect.
+    Otherwise, the program execution will abort.
+    The provided error message may be used by a runtime to propagate the error
+    to the user.
+
+    Example:
+
+    ```mlir
+    assert %b, "Expected ... to be true"
+    ```
+  }];
+
+  let arguments = (ins I1:$arg, StrAttr:$msg);
+
+  let assemblyFormat = "$arg `,` $msg attr-dict";
+
+  // AssertOp is fully verified by its traits.
+  let verifier = ?;
+}
+
 //===----------------------------------------------------------------------===//
 // AssumeAlignmentOp
 //===----------------------------------------------------------------------===//
diff --git a/mlir/test/Dialect/Standard/ops.mlir b/mlir/test/Dialect/Standard/ops.mlir
--- a/mlir/test/Dialect/Standard/ops.mlir
+++ b/mlir/test/Dialect/Standard/ops.mlir
@@ -18,3 +18,7 @@
   return %0 : tensor<index>
 }
 
+func @assert(%arg : i1) {
+  assert %arg, "Some message in case this assertion fails."
+  return
+}