diff --git a/src/blocks/mrc_list_add_item.ts b/src/blocks/mrc_list_add_item.ts
index 81f45a1a..353002d8 100644
--- a/src/blocks/mrc_list_add_item.ts
+++ b/src/blocks/mrc_list_add_item.ts
@@ -16,7 +16,7 @@
  */
 
 /**
- * @fileoverview Miscellaneous blocks.
+ * @fileoverview Block to add an item to the end of a list.
  * @author lizlooney@google.com (Liz Looney)
  */
 
diff --git a/src/blocks/mrc_math_min_max.ts b/src/blocks/mrc_math_min_max.ts
index d2d4b0d6..f30e8edb 100644
--- a/src/blocks/mrc_math_min_max.ts
+++ b/src/blocks/mrc_math_min_max.ts
@@ -16,7 +16,7 @@
  */
 
 /**
- * @fileoverview Miscellaneous blocks.
+ * @fileoverview Blocks for math min and max.
  * @author lizlooney@google.com (Liz Looney)
  */
 
diff --git a/src/blocks/mrc_misc_comment.ts b/src/blocks/mrc_misc_comment.ts
index 4d84d3aa..72166e6f 100644
--- a/src/blocks/mrc_misc_comment.ts
+++ b/src/blocks/mrc_misc_comment.ts
@@ -16,7 +16,7 @@
  */
 
 /**
- * @fileoverview Miscellaneous blocks.
+ * @fileoverview Block for a comment.
  * @author lizlooney@google.com (Liz Looney)
  */
 
diff --git a/src/blocks/mrc_misc_evaluate_but_ignore_result.ts b/src/blocks/mrc_misc_evaluate_but_ignore_result.ts
index 345ba959..8a85b6db 100644
--- a/src/blocks/mrc_misc_evaluate_but_ignore_result.ts
+++ b/src/blocks/mrc_misc_evaluate_but_ignore_result.ts
@@ -16,7 +16,7 @@
  */
 
 /**
- * @fileoverview Miscellaneous blocks.
+ * @fileoverview Blocks for evaluating something, but ignoring the result.
  * @author lizlooney@google.com (Liz Looney)
  */