diff --git a/matlab/catalog/eliminateEmptyValues.m b/matlab/catalog/eliminateEmptyValues.m
index fe24199..99c5e86 100644
--- a/matlab/catalog/eliminateEmptyValues.m
+++ b/matlab/catalog/eliminateEmptyValues.m
@@ -15,6 +15,10 @@ function varargout = eliminateEmptyValues(varargin)
 %   arrays, and the function will remove entries that are empty in any of
 %   the input columns.
 %
+%   This function is designed to work with catalog objects. For more
+%   information about the catalog format, refer to the documentation:
+%   https://docs.cyfronet.pl/display/ISDOC/Catalog+-+description
+%
 %   Example:
 %       [a, b] = eliminateEmptyValues([1, NaN, 3], {'A', '', 'C'});
 %       % Result: a = [1, 3], b = {'A', 'C'}
diff --git a/matlab/catalog/extractColumns.m b/matlab/catalog/extractColumns.m
index 8bc90ec..1d1907c 100644
--- a/matlab/catalog/extractColumns.m
+++ b/matlab/catalog/extractColumns.m
@@ -14,6 +14,9 @@ function [varargout] = extractColumns(catalog, varargin)
 %   each structure has fields 'field' and 'val'. The function returns the
 %   values of the requested columns.
 %
+%   For more details on the catalog format, see:
+%   https://docs.cyfronet.pl/display/ISDOC/Catalog+-+description
+%
 %   Example:
 %       catalog(1).field = 'ID'; catalog(1).val = [1, 2, 3];
 %       catalog(2).field = 'Time'; catalog(2).val = [100, 200, 300];
@@ -34,6 +37,9 @@ function column = findColumn(catalog, colName)
 %   column = FINDCOLUMN(catalog, colName) searches the catalog structure
 %   for the specified column name and returns its values. If the column
 %   does not exist, an error is thrown.
+%
+%   Refer to the catalog documentation for further information:
+%   https://docs.cyfronet.pl/display/ISDOC/Catalog+-+description
 
     for c = 1:length(catalog)
         if strcmp(catalog(c).field, colName)
diff --git a/matlab/catalog/findCatalogColumn.m b/matlab/catalog/findCatalogColumn.m
index 00926d3..c7daf88 100644
--- a/matlab/catalog/findCatalogColumn.m
+++ b/matlab/catalog/findCatalogColumn.m
@@ -16,6 +16,9 @@ function columnIdx = findCatalogColumn(catalog, colName)
 %       idx = findCatalogColumn(catalog, 'Time');
 %       % Result: idx = 2
 %
+%   For more details on the catalog format, refer to the documentation:
+%   https://docs.cyfronet.pl/display/ISDOC/Catalog+-+description
+%
 %   Note: This function is intended to be used in conjunction with other
 %   catalog processing functions.
 %
diff --git a/matlab/catalog/sortByTime.m b/matlab/catalog/sortByTime.m
index c077538..41e11be 100644
--- a/matlab/catalog/sortByTime.m
+++ b/matlab/catalog/sortByTime.m
@@ -4,7 +4,7 @@
 % -----------------
 %
 function [sortedCatalog] = sortByTime(catalog)
-% SORTBYTIME Sorts a catalog structure by the 'Time' column
+% SORTBYTIME Sorts a seismic catalog structure by the 'Time' column
 %
 %   sortedCatalog = SORTBYTIME(catalog) sorts the given catalog structure
 %   based on the values in the 'Time' column. The catalog is expected to be
@@ -12,6 +12,10 @@ function [sortedCatalog] = sortByTime(catalog)
 %   'val'. The function rearranges the catalog entries in ascending order
 %   of time.
 %
+%   This function is specific to seismic catalogs. For more general
+%   information on catalogs, refer to:
+%   https://docs.cyfronet.pl/display/ISDOC/Catalog+-+description
+%
 %   Example:
 %       catalog(1).field = 'ID'; catalog(1).val = [3, 2, 1];
 %       catalog(2).field = 'Time'; catalog(2).val = [300, 200, 100];