diff --git a/src/analysis/Histogram.cpp b/src/analysis/Histogram.cpp
index 979d5c94f8336b5e57e7b4f4c42559df4f07ed9e..394cedbfd270bc5138eecf3f80857d155e91fd3a 100644
--- a/src/analysis/Histogram.cpp
+++ b/src/analysis/Histogram.cpp
@@ -33,7 +33,9 @@ namespace analysis{
 //+PLUMEDOC ANALYSIS HISTOGRAM
 /* 
 Calculate the probability density as a function of a few CVs either using kernel density estimation, or a discrete
-histogram estimation. In case a kernel density estimation is used the probability density is estimated as a
+histogram estimation. 
+
+In case a kernel density estimation is used the probability density is estimated as a
 continuos function on the grid with a BANDWIDTH defined by the user. In this case the normalisation is such that
 the INTEGRAL over the grid is 1. In case a discrete density estimation is used the probabilty density is estimated
 as a discrete function on the grid. In this case the normalisation is such that the SUM of over the grid is 1.
diff --git a/src/bias/LWalls.cpp b/src/bias/LWalls.cpp
index 0337fa86706e82495739ddb6e243502102cb5a47..dfbffa7fbf5950d6974f66303a5f556048afd0ef 100644
--- a/src/bias/LWalls.cpp
+++ b/src/bias/LWalls.cpp
@@ -31,7 +31,7 @@ namespace bias{
 
 //+PLUMEDOC BIAS LOWER_WALLS
 /*
-The LOWER_WALLS and UPPER_WALLS keywords define a wall for the value of one or more collective variables,
+Defines a wall for the value of one or more collective variables,
  which limits the region of the phase space accessible during the simulation. 
 
 The restraining potential starts acting on the system when the value of the CV is greater 
diff --git a/src/bias/UWalls.cpp b/src/bias/UWalls.cpp
index 9e4e8d95f5c23eb70a2176abb6608152859536ed..5d5e78668e79533d0691c799a6dfef33fb9b9101 100644
--- a/src/bias/UWalls.cpp
+++ b/src/bias/UWalls.cpp
@@ -31,7 +31,7 @@ namespace bias{
 
 //+PLUMEDOC BIAS UPPER_WALLS
 /*
-The LOWER_WALLS and UPPER_WALLS keywords define a wall for the value of one or more collective variables,
+Defines a wall for the value of one or more collective variables,
  which limits the region of the phase space accessible during the simulation. 
 
 The restraining potential starts acting on the system when the value of the CV is greater