diff --git a/src/digraph.c b/src/digraph.c
index fc29ac7..9f7d0cc 100644
--- a/src/digraph.c
+++ b/src/digraph.c
@@ -1425,6 +1425,8 @@
 	{'W', '=', 0x20a9},
 	{'=', 'e', 0x20ac}, /* euro */
 	{'E', 'u', 0x20ac}, /* euro */
+	{'=', 'R', 0x20bd}, /* rouble */
+	{'=', 'P', 0x20bd}, /* rouble */
 	{'o', 'C', 0x2103},
 	{'c', 'o', 0x2105},
 	{'o', 'F', 0x2109},