diff --git a/include/sframe-api.h b/include/sframe-api.h
index 8c26257fb64..507f806ab4c 100644
--- a/include/sframe-api.h
+++ b/include/sframe-api.h
@@ -230,6 +230,12 @@ extern bool
 sframe_fre_get_ra_mangled_p (sframe_decoder_ctx *dctx,
 			     sframe_frame_row_entry *fre, int *errp);
 
+/* Get whether the RA is undefined (i.e. outermost frame).  */
+
+bool
+sframe_fre_get_ra_undefined_p (const sframe_decoder_ctx *dctx ATTRIBUTE_UNUSED,
+			       const sframe_frame_row_entry *fre, int *errp);
+
 /* The SFrame Encoder.  */
 
 /* Create an encoder context with the given SFrame format version VER, FLAGS
diff --git a/libsframe/libsframe.ver b/libsframe/libsframe.ver
index 8cc80da2f26..4286a72b93b 100644
--- a/libsframe/libsframe.ver
+++ b/libsframe/libsframe.ver
@@ -41,3 +41,8 @@ LIBSFRAME_2.0 {
   local:
     *;
 } LIBSFRAME_0.0;
+
+LIBSFRAME_2.1 {
+  global:
+    sframe_fre_get_ra_undefined_p;
+} LIBSFRAME_2.0;
diff --git a/libsframe/sframe.c b/libsframe/sframe.c
index f56742ee1a1..bd39780a913 100644
--- a/libsframe/sframe.c
+++ b/libsframe/sframe.c
@@ -131,6 +131,12 @@ sframe_get_fre_ra_mangled_p (uint8_t fre_info)
   return SFRAME_V1_FRE_MANGLED_RA_P (fre_info);
 }
 
+static bool
+sframe_get_fre_ra_undefined_p (uint8_t fre_info)
+{
+  return SFRAME_V1_FRE_OFFSET_COUNT (fre_info) == 0;
+}
+
 /* Access functions for info from function descriptor entry.  */
 
 static uint32_t
@@ -777,6 +783,18 @@ sframe_fre_get_ra_mangled_p (sframe_decoder_ctx *dctx ATTRIBUTE_UNUSED,
   return sframe_get_fre_ra_mangled_p (fre->fre_info);
 }
 
+/* Get whether the RA is undefined (i.e. outermost frame).  */
+
+bool
+sframe_fre_get_ra_undefined_p (const sframe_decoder_ctx *dctx ATTRIBUTE_UNUSED,
+			       const sframe_frame_row_entry *fre, int *errp)
+{
+  if (fre == NULL || !sframe_fre_sanity_check_p (fre))
+    return sframe_set_errno (errp, SFRAME_ERR_FRE_INVAL);
+
+  return sframe_get_fre_ra_undefined_p (fre->fre_info);
+}
+
 static int
 sframe_frame_row_entry_copy (sframe_frame_row_entry *dst,
 			     sframe_frame_row_entry *src)