diff --git a/docs/running_psalm/issues.md b/docs/running_psalm/issues.md
index 7f6341b7a..4e08664fa 100644
--- a/docs/running_psalm/issues.md
+++ b/docs/running_psalm/issues.md
@@ -25,6 +25,7 @@
  - [FalseOperand](issues/FalseOperand.md)
  - [ForbiddenCode](issues/ForbiddenCode.md)
  - [ForbiddenEcho](issues/ForbiddenEcho.md)
+ - [IfThisIsMismatch](issues/IfThisIsMismatch.md)
  - [ImplementedParamTypeMismatch](issues/ImplementedParamTypeMismatch.md)
  - [ImplementedReturnTypeMismatch](issues/ImplementedReturnTypeMismatch.md)
  - [ImplicitToStringCast](issues/ImplicitToStringCast.md)
diff --git a/docs/running_psalm/issues/IfThisIsMismatch.md b/docs/running_psalm/issues/IfThisIsMismatch.md
new file mode 100644
index 000000000..c15aa5fc6
--- /dev/null
+++ b/docs/running_psalm/issues/IfThisIsMismatch.md
@@ -0,0 +1,3 @@
+# IfThisIsMismatch
+
+Emitted when the type in `@psalm-if-this-is` annotation cannot be contained by the objects actual type.