diff --git a/README.adoc b/README.adoc
index 48b234b..2b676ab 100644
--- a/README.adoc
+++ b/README.adoc
@@ -130,7 +130,7 @@ include("src/RL/latex_table.jl")
 latex_rl_table(env_helper, FILENAME_WITHOUT_EXTENSION)
 ----
 
-`FILENAME_WITHOUT_EXTENSION` has to be replaced by the wanted file name without extension of the `.tex` file. The documentation of `latex_rl_table` explains where the output is placed.
+`FILENAME_WITHOUT_EXTENSION` has to be replaced by the wanted file name without extension of the `.tex` file. The method's documentation explains where the output is placed.
 
 The output file can be used in a LaTeX document:
 
@@ -164,16 +164,16 @@ To plot the mean of kappa as the ratio of the eigenvalues of the gyration tensor
 [source,julia]
 ----
 include("analysis/mean_kappa.jl")
-plot_mean_kappa(; rl_dir=rl_dir, n_last_episodes=N_LAST_EPISODES)
+plot_mean_κ(; rl_dir=rl_dir, n_last_episodes=N_LAST_EPISODES)
 ----
 
-`N_LAST_EPISODES` is the number of the last episodes of the learning process to average over.
+`N_LAST_EPISODES` is the number of the last episodes of the learning process to average over. The method's documentation explains where the output is placed.
 
 == Run analysis
 
 After running the following command blocks in the REPL, the output can be found in the directory `ReCo.jl/exports/graphics`.
 
-=== Mean squared displacement
+=== Mean squared displacement and random walk
 
 [source,julia]
 ----
diff --git a/analysis/mean_kappa.jl b/analysis/mean_kappa.jl
index 6ae790e..7c74438 100644
--- a/analysis/mean_kappa.jl
+++ b/analysis/mean_kappa.jl
@@ -6,7 +6,18 @@ using ReCo: ReCo
 
 include("../src/Visualization/common_CairoMakie.jl")
 
-function plot_mean_kappa(; rl_dir::String, n_last_episodes::Int64)
+"""
+    plot_mean_κ(; rl_dir::String, n_last_episodes::Int64)
+
+Plot the mean of `κ` of the learning process at the directory `rl_dir`.
+
+`κ` is the ratio of the eigenvalues of the gyration tensor. `n_last_episodes` is the number of the last episodes of the learning process to average over.
+
+The output is `rl_dir/mean_kappa.pdf`.
+
+Return `nothing`.
+"""
+function plot_mean_κ(; rl_dir::String, n_last_episodes::Int64)
     dir_content = readdir(rl_dir; join=true, sort=true)
     n_content = length(dir_content)
 
diff --git a/src/RL/latex_table.jl b/src/RL/latex_table.jl
index ccdc3dd..18b19b5 100644
--- a/src/RL/latex_table.jl
+++ b/src/RL/latex_table.jl
@@ -1,6 +1,8 @@
 using DataFrames: DataFrames
 using PrettyTables: pretty_table
 
+using ReCo: ReCo
+
 function latex_table(
     dataframe::DataFrames.DataFrame, filename::String; path::String="exports/$filename"
 )
@@ -12,7 +14,7 @@ function latex_table(
 end
 
 """
-    latex_rl_table(env_helper, filename_without_extension::String)
+    latex_rl_table(env_helper::ReCo.RL.EnvHelper, filename_without_extension::String)
 
 Generate a LaTeX table to the Q-matrix of `env_helper`.
 
@@ -20,7 +22,7 @@ The output is `ReCo.jl/exports/filename_without_extension.tex`. `env_helper` has
 
 Return `nothing`.
 """
-function latex_rl_table(env_helper, filename_without_extension::String)
+function latex_rl_table(env_helper::ReCo.RL.EnvHelper, filename_without_extension::String)
     table = copy(env_helper.shared.agent.policy.learner.approximator.table)
 
     for col in 1:size(table)[2]