diff --git a/src/analysis/Histogram.cpp b/src/analysis/Histogram.cpp
index befe10b728fff85359ed663582350e2965f1e926..2f858906cd3f5646ae5a634e11e57150e6d29c3a 100644
--- a/src/analysis/Histogram.cpp
+++ b/src/analysis/Histogram.cpp
@@ -108,6 +108,8 @@ HISTOGRAM ...
 ... HISTOGRAM
 \endverbatim
 
+\bug Option FREE-ENERGY without USE_ALL_DATA is not working properly. See \issue{175}.
+
 */
 //+ENDPLUMEDOC